- 13. Januar 2009 16:00 Uhr bis 17:30 Uhr
- Vahid Joekar-Niasar
Environmental Hydrogeology Group, University of Utrecht
Then dynamic pore-network models will be introduced, which have been used much less compared to quasi-static ones. We have developed a new dynamic pore-network model for studying transient behavior of average capillary pressure and saturation. Traditional two-phase flow models assume that macroscopic phase pressure difference is a function of macroscopic saturation. However, under dynamic conditions, the difference of macroscopic phase pressures is known to be a function of time rate of saturation change.
Significant difference between our dynamic pore network model and conventional dynamic pore-network models is in solving the pressure field. Pressure field is solved for each phase separately and they are related to each other by local capillary pressure which is a function of local interface curvature.
Finally we have simulated a drainage experiment for different viscosity ratios. We have studied functionality of the dynamic coefficient as a function of saturation and viscosity ratios. In addition, effect of global pressure difference on trapping mechanism and invading front topology has been studied.